RCV or any voting system isn't better than what the current prescription is for CVRA lawsuits: having districts. It enables more local elections, lower cost of campaigning, and more minority representation. Edit: It's also easier to have neutral district lines drawn (like in CA and a few states by boards) than to pick a voting system that might not achieve the objectives of the CVRA.

If you're wondering why it was vetoed, maybe look at the history of CVRA lawsuits and how having districts has helped communities more than RCV. RCV is an apportioning method, which doesn't necessarily make it a good voting method.